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Diamond Ring Chess

Introduction

This variant started with the idea of putting the duals of the Chaturanga (4R) back rank onto another dimension but still within some kind of 2d board. This is in contrast to Courier and my offshoots of it, Courier Kamil and Courier Ashtaranga, which add them alongside the original pieces.

Immediately I thought of Quadruple Besiege Chess, as this has camps facing in both dimensions - sa well as both directions in each dimension. Unfortunately the simple 2x8x8 would not work as it would be impossibl.e to avoid starting with pieces En Prise. Next I considered linking the two boards inm some completely different way, perhaps so that they would overlap, but this would make for too complex a geometry and too crowded a board. The next consideration was retaining the standard QB interface but enlarging the boards to 2x10x10 with Pawns topping and tailing the ranks, but that would still leave the new Pawns starting En Prise. After that it was a choice of going to 2x12x12 or taking out the Camels and bringing Knights to the corners where the original Pawn ranks intersect. The latter seemed more promising as I really wanted to avoid exceeding 200 squares - over thrice the Chaturanga/FIDE size and over twice that of the Courier board - and was defensible in that the radial pieces would still all be nicely dualled even if the oblique ones would not.

Then it suddenly struck that having a single 12x12 board and drawing the Knights in and removing Camels was an option, and one not only reducing the number of squares well below 200 but simplifying from the QB joins by having simple toroidal joins. This gave Pawn diagonals facing along a quadruple diagonal besiege. My last touch was putting the Bishops further in than the Dabbabas to prevent any initial En Prise. I was happy with this array.

The final stage was a name. Well, as the arrays were diamond in shape on a board that was a toroidal ring, I realised that these words went rather well together.

Setup


I have shown the board broken through both camps. I could have chosen two breaks through the White camp, but the diagram that I chose illustrates the equal nature of the wraparound for both players and also draws attention to the underlying 4R pattern.

Pieces

The pieces are listed in order outward. The following table illustrates how the number of pieces per army (PPA) grows to twice the number in the first variant in the series to use them, and their array distance (AD) from the King/Wazir/Ferz group preserves its order through the series.
Chaturanga/Xiang QiCourierCourier Kamil/AshtarangaDiamond Ring Chess
KingPPA=1, AD=0PPA=1, AD=0PPA=1, AD=0PPA=1, AD=0
FerzPPA=1, AD=0PPA=1, AD=0PPA=2, AD=0PPA=2, AD=0
WazirnonePPA=1, AD=0PPA=1, AD=0PPA=1, AD=0
BishopnonePPA=2, AD=1PPA=2, AD=2PPA=4, AD=1
ElephantPPA=2, AD=1PPA=2, AD=2PPA=2, AD=3PPA=4, AD=1
KnightPPA=2, AD=2PPA=2, AD=3PPA=2, AD=4PPA=4, AD=root 2
RookPPA=2, AD=3PPA=2, AD=4PPA=2, AD=5PPA=4, AD=2
DabbabanonenonePPA=2, AD=6PPA=4, AD=2
The KING moves one step in any of the 8 radial directions, and must be kept out of Check.
The FERZ moves one step diagonally. It too inherits its 4R place as a central piece, representing the royal adviser that its name means.
The WAZIR, dual of the Ferz, moves one step orthogonally. Like the Ferz it is a central piece.
The ELEPHANT moving exactly two squares in any of the 4 diagonal directions. The version used in this variant is a leaping one, and the halfway square may be empty or occupied. It inherits its 4R place as a symmetric piece bordering the central ones.
The BISHOP, dual of the Rook, moves up to 11 squares (to prevent null moves) diagonally through empty squares. It inherits its Courier place as a symmetric piece bordering the central ones.
The KNIGHT makes any 2:1 leap, and in this variant cannot be blocked. It inherits its 4R place as the average-distance symmetric piece from the central ones.
The ROOK moves up to 11 squares (to prevent null moves) orthogonally through empty squares. It inherits its 4R place as a furthest symmetric piece from the central ones.
The DABBABA moves exactly two squares in any of the 4 orthogonal directions. The version used in this variant is a leaping one, and the halfway square may be empty or occupied. It inherits its Courier Kamil/Ashtaranga place as a furthest symmetric piece from the central ones.
The PAWN moves one step orthogonally forward except when capturing, which it does one step diagonally forward. The definition of "forward" is not immediately obvious on this board, but basically means that it must always increase the distance from the nearest square of its own camp. This offers two orthogonals increasing it by 1, and one diagonal increasing by 2 (the greater progress of the capture might remind you of McCooey's hex Chess) until it reaches an orthogonal on which enemy King/Wazir/Ferz squares lie. On reaching one the options are reduced to one orthogonal and one diagonal, both increasing the distance by 1. Here are the distances for the White Pawns, with the same breaks as on the main diagram:
210      012
3210    0123
43210  01234
543210012345
654321123456
765432234567
765432234567
654321123456
543210012345
43210  01234
3210    0123
210      012

Rules

There is no initial double-step move, En Passant, or Castling.

Pawns reaching an enemy King/Wazir/Ferz square can obviously move no further as Pawns, and so must be promoted. The promotee can be any other kind of capturable array piece, although I anticipate a preference for Rooks!

Check, Checkmate, and Stalemate are standard.

Notes

The variant can be played with two pairs, distinguishable by size, of identical standard sets. Large pieces (Queen apart) as themselves, large Queen as Wazir, small Queens as Ferzes, small Knights as Dabbabas, small Bishops as Elephants, and small Rooks on standby for promotee Rooks!

A few subvariants come to mind. They are too minor to use as a basis to tick extra options.
* The board as shown, without the wraparound, but allowing Pawns on the edge to capture away from it.
* As above with four different players, substituting whichever of King or Wazir is missing for each Ferz.
* Diamond Ring Mitregi. This substitutes Wing for Dabbaba, Mitre for Elephant, Gold for Wazir, Silver for Ferz and inherits Mitregi promotion anywhere within the enemy camp. For long/range FO moves each step must take the piece further from camp.
* 4 Linepiece Diamond Ring variants. These substituute Gryphon/Girlscout/Wolf for Dabbaba, and Anchorite/Boyscout/Fox for Elephant respectively.
* Diamond Ring Wildeurasian. This substitutes Cannon for Dabbaba, Arrow for Elephant, Queen for Wazir, Tank for King's Ferz, and Gnu for Wazir's Ferz. The last three may not enter the enemy camp but can interact between the camps.

A more complex option is Diamond Ring Fusion, as it has lot more possible piece types. Rooks would be debarred from fusing with other orthogonal pieces, and Bishops with other diagonal pieces. The rest are:
orthogonal+diagonal: R+B=Queen, R+F=Chatelaine, R+E=Infanta, W+B=Primate, W+F=Prince, W+E=Waffle, D+B=Inquisitor, D+F=Fezbaba, D+E=Alibaba;
other orthogonal compounds: R+N=Marshal, N+W=Marshlander, N+D=Carpenter, W+D=Wazbaba.
other diagonal compounds: B+N=Cardinal, N+F=Cardilander, N+E=Kangaroo, F+E=Fearful.



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By Charles Gilman.
Web page created: 2007-01-25. Web page last updated: 2016-03-24